Barrel-syringe



STEPHEN P. HART, OF BOSTON, MASSACHUSETTS.

BARREL-SYRINGE.

Specification of Letters Patent No. 25,409, dated September 13, 1859.

To @ZZ whom t may concern:

Be it known that I, STEPHEN P. HART, of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Enema-Syringes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, making part of this specifcation, in which is represented a longitudinal section through one of my improved syringes.

The Well known syringe consisting of an elastic india rubber globe or egg shaped vessel with an induction andan eduction tube or pipe, is liable to several objections, the chief of which arises from the liability of the syringes to get out of order and require repairs, and the failure of the globe after being some time in use to expand with sufficient readiness after being compressed. To remedy these diiiiculties the india rubber globe has been replaced by a small metallic syringe, but this was found to be inconvenient as it required both hands to operate it.

y invent-ion consists in the insertion of a spring Within a metallic syringe so arranged as to raise the piston after it is depressed by hand and by which means it may be operated by one hand.

To enable others skilled in the art to understand my invention I will proceed to describe the manner in Which I have carried it out.

A is the induction pipe, the entrance to Which is commanded by a valve b.

C is the metallic barrel of the syringe from the base of Which rises a rod D, which enters the piston rod F when the piston is depressed,

g is a coiled spring which surrounds the rod D, and by which the piston is raised after being depressed, and when the handle H is released by the hand.

K, is the eduction pipe having a disk valve e of india rubber to prevent the entrance of air when the piston is raised.

In operating this syringe, the barrel C is held between the first and second fingers of the right hand, and the piston is depressed by pressure of the thumb upon the handle L 

